pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, accessing a crafted PDF stream with a large number of filters or multiple filters that pass around large amounts of data can cause large memory consumption. This issue is fixed in version 6.20.0.
CVE-2026-113795
CVSS base score
Not scored yet
Severity
UNKNOWN
Weakness
CWE-400, CWE-770
Last modified
October 30, 2026